Platelet Adhesion and Aggregation Dynamics over Collagen- and VWF-coated Surfaces: Insights from Dissipative Particle...

Area of Science:

• Biophysics
• Computational Biology
• Hematology

Background:

• Platelet adhesion and aggregation are crucial for hemostasis and thrombosis.
• Platelet surface receptors bind to von Willebrand factor (VWF) and collagen to initiate clotting.
• Clot formation involves complex signaling and morphological changes.

Purpose of the Study:

• Investigate platelet adhesion and aggregation mechanisms under physiological flow.
• Utilize dissipative particle dynamics (DPD) simulations combined with microfluidic experiments.
• Compare simulation results with experimental observations to understand clot dynamics.

Main Methods:

• Performed DPD simulations with a viscoelastic spring-dashpot model for platelet interactions.
• Used microfluidic channels coated with collagen and VWF, perfused with human blood.
• Implemented a probabilistic approach for platelet attachment/detachment modeling.

Main Results:

• DPD simulations accurately reproduced experimental observations of platelet aggregation.
• Simulations showed scattered multilayer clots on collagen-coated surfaces.
• Simulations demonstrated single-layer, isolated platelet adhesion on VWF-coated surfaces.

Conclusions:

• The study successfully models platelet adhesion and aggregation dynamics.
• Distinct surface coatings (collagen vs. VWF) lead to different platelet aggregation patterns.
• Simulation results align quantitatively with experimental findings, validating the model.